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    <!-- 
        1. 安装工具 npm i babel-cli babel-preset-env browserify(webpack) -D
        2. 编译 npx babel src/js -d dist/js --presets=babel-preset-env
        3. 打包 npx browserify dist/js/app.js -o dist/bundle.js
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     <script src="dist/bundle.js"></script>
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